2004 2005 2006 2007 2008 2009 2010 2011 2012 $0 $5,000,000 $10,000,000 $15,000,000 $20,000,000
| Year | Trade Value | Weight (kg) | Quantity |
| 2005 | $10,432,374 | 215,649 | 577,368 |
| 2006 | $11,642,556 | 367,767 | 786,320 |
| 2007 | $11,115,754 | 231,966 | 617,851 |
| 2008 | $10,046,051 | 166,183 | 437,869 |
| 2009 | $8,508,537 | 148,737 | 420,320 |
| 2010 | $11,723,128 | 354,830 | 1,125,098 |
| 2011 | $14,129,536 | 591,531 | 978,859 |
Note: Quantity represents Number of items
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